What element has the symbol 'Co'?

The story behind the answer

Co is the chemical symbol for cobalt, a hard, silvery-blue transition metal (atomic number 27). Copper’s symbol is Cu (from Latin cuprum), and carbon is C. “Cobaltite” isn’t an element at all—it’s a cobalt-bearing mineral (CoAsS).

Cobalt’s vivid “cobalt blue” pigment colored glass and ceramics for centuries. The name comes from the German Kobold (“goblin”), since arsenic-laced ores sickened miners. Today cobalt is crucial in